sesquiterpene

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Related to Sesquiterpenes: Diterpenes, Monoterpenes

sesquiterpene

(ˌsɛskwɪˈtɜːpiːn)
n
(Elements & Compounds) any of certain terpenes whose molecules contain one and a half times as many atoms as a normal terpene. Formula: C15H24
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Cedrol, widdrol, thujopsene, alpha cederene, beta cedrene, and a range of sesquiterpenes are the key components involved in the China Cedar wood oil.
guajava fresh leaves is composed mainly by hydrocarbon sesquiterpenes (62.0%), followed by oxygenated sesquiterpenes (14.8%), hydrocarbons monoterpenes (1.8%), and oxygenated monoterpenes (1.2%) (Table 1).
A total of 58 secondary metabolites, mainly comprising 18 esters, six monoterpene hydrocarbons, two oxygenated monoterpenes, 20 sesquiterpene hydrocarbons, seven oxygenated sesquiterpenes, and four ketones, were positively or tentatively identified.
These compounds were grouped into phenylpropanoids, major compounds (2.64-71.52%), sesquiterpenes (5.40-6.38%), monoterpenes (0.17-4.04%), oxygenated monoterpenes (0.34-0.82%), and oxygenated sesquiterpenes (0.97-1.29%).
Aromadendrene oxide-(1) is a Sesquiterpene oxide which are known to have different activities like anti-tumor, analgesic, antibacterial, antiinflammatory, sedative, fungicide [21] and the oxygenated sesquiterpenes and flavonoids have more antioxidant activity than the non-oxygenated sesquiterpenes [22, 23].
It was also found that the essential oil mainly composed of oxygenated compounds 51.35-59.74% while monoterpene hydrocarbons and sesquiterpenes constituted 38.86-47.43% and 0.36-0.6% of it, respectively.
The exception is a chemotype with phenolic compounds thymol and carvacrol as the principal constituents [26], and varieties with no artemisia ketone detected [27], and with oxygenated sesquiterpenes as the major constituents [28].
Combining with DEPT NMR, the compound contains 3 quaternary carbon signals, 4 methine signals, 2 methylene signals, and 4 methyl signals, indicating the compound to be lower 2 carbon sesquiterpenes. Thus, GB-10 is (3S, 5R, 6S)-6-((E)-3-hydroxybut-1-enyl)-1,1,5-trimethylcyclohexane-3,5,6-triol.
With the further analysis of the GS-MS results, it was found that the essential oil contained a plenty of monoterpenes and sesquiterpenes, and their contents accounted for 27.0% and 21.3% of the essential oil, respectively.
Essential oils are mixtures of volatile compounds, including monoterpenes, sesquiterpenes, and phenylpropanoids which may easily percolate through cell membranes, a great advantage in terms of interaction with intracellular targets.